MIC2549A-1BTSTR Micrel Semiconductor, MIC2549A-1BTSTR Datasheet

MIC2549A-1BTSTR

Manufacturer Part Number

MIC2549A-1BTSTR

Description

Manufacturer

Micrel Semiconductor

Datasheet

1.MIC2545A-1YMTR.pdf (16 pages)

Specifications of MIC2549A-1BTSTR

Date_code

03+

Packing_info

TSSOP-14L

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General Description

The MIC2545A and MIC2549A are integrated high-side

power switches optimized for low loss DC power switching

and other power management applications, including Ad-

vanced Configuration and Power Interface (ACPI). The

MIC2545A/49A is a cost-effective, highly integrated solution

that requires few external components to satisfy USB and

ACPI requirements.

Load current management features include a precision,

resistor-programmable output current-limit and a soft-start

circuit, which minimizes inrush current when the switch is

enabled. Thermal shutdown, along with adjustable current-

limit, protects the switch and the attached device.

The MIC2545A/49A’s open-drain flag output is used to indi-

cate current-limiting or thermal shutdown to a local controller.

The MIC2549A has an additional internal latch which turns

the output off upon thermal shutdown, providing robust fault

control. The enable signal is compatible with both 3V and 5V

logic, and is also used as the thermal shutdown latch reset for

the MIC2549A.

The MIC2545A and MIC2549A are available in active-high

and active-low enable versions in 8-pin DIP, SOIC, and

TSSOP packages.

Typical Application

UL Recognized Component

April 2004

MIC2545A/2549A

Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com

Typical Advanced Configuration and Power Interface (ACPI) Application

On/Off

+5V

10k

SET

FLG

GND

ILIM

MIC2545A

OUT

0.1µF

Features

• 2.7V to 5.5V input

• Adjustable current-limit up to 3A

• Reverse current flow blocking

• 90 A typical on-state supply current

• 1 A typical off-state supply current

• 50m maximum on-resistance

• Open-drain fault flag

• Thermal shutdown

• Thermal shutdown output latch (MIC2549A)

• 2ms (slow) soft-start turn-on, fast turnoff

• Available with active-high or active-low enable

Applications

• USB power distribution

• PCI Bus Power Switching

• Notebook PC

• ACPI power distribution

• PC card hot swap applications

• Inrush current-limiting

Programmable Current Limit High-Side Switch

33µF

MIC2545A/2549A

Peripheral

M9999-041204

Micrel

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